Table 1.

Thermodynamic constants used to predict the formation of potential formation of soluble AlH₃${\mathrm{SiO}}_{\mathrm{4}}^{\mathrm{2+}}$ using PhreeqcI 3.1.7 (Parkhurst, 2014).

	log K
Al3+ + H4${\mathrm{SiO}}_{\mathrm{4}}^{\mathrm{0}}$ ⇌ AlH3${\mathrm{SiO}}_{\mathrm{4}}^{\mathrm{2+}}$ + H+	–2.38
Al3+ + H2O ⇌ AlOH2+ + H+	–5.00
Al3+ + 2H2O ⇌ ${\mathrm{Al(OH)}}_{\mathrm{2}}^{\mathrm{+}}$ + 2H+	–10.1
Al3+ + 3H2O ⇌ ${\mathrm{Al(OH)}}_{\mathrm{3}}^{\mathrm{0}}$ + 3H+	–16.8
Al3+ + 4H2O ⇌ ${\mathrm{Al(OH)}}_{\mathrm{4}}^{\mathrm{-}}$ + 4H+	–22.99

Values were taken from Nordstrom and May (1996) and Pokrovski et al. (1996).